gpio: add tps65218 gpio
Driver for the GPIO block found in ti's tps65218 pmics.
The device has two GPIOs and one GPO pin which can be configured as follows:
GPIO1:
-general-purpose, open-drain output controlled by GPO1 user bit and/or
sequencer
-DDR3 reset input signal from SOC. Signal is either latched or
passed-trough to GPO2 pin. See below for details.
GPO2:
-general-purpose output controlled by GPO2 user bit
-DDR3 reset output signal. Signal is controlled by GPIO1 and PGOOD.
See below for details.
-Output buffer can be configured as open-drain or push-pull.
GPIO3:
-general-purpose, open-drain output controlled by GPO3 user bit and/or
sequencer
-reset input-signal for DCDC1 and DCDC2.
The input configurations are not meant to be used by the user so the driver
only offers GPOs.
v2: Added request routine that evaluates the fw config flags and removed module
owner
v3: Added .direction_input() routine, and took care of all Linus Walleij
suggestions (clamp to bool, use proper include)
Signed-off-by: Nicolas Saenz Julienne <nicolassaenzj@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Nicolas Saenz Julienne
Linus Walleij
Родитель
b866526d0c
Коммит
c366c76a2c
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@ -889,6 +889,13 @@ config GPIO_TIMBERDALE
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---help---
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Add support for the GPIO IP in the timberdale FPGA.
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config GPIO_TPS65218
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tristate "TPS65218 GPIO"
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depends on MFD_TPS65218
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help
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Select this option to enable GPIO driver for the TPS65218
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chip family.
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config GPIO_TPS6586X
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bool "TPS6586X GPIO"
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depends on MFD_TPS6586X
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@ -98,6 +98,7 @@ obj-$(CONFIG_ARCH_TEGRA) += gpio-tegra.o
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obj-$(CONFIG_GPIO_TIMBERDALE) += gpio-timberdale.o
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obj-$(CONFIG_GPIO_PALMAS) += gpio-palmas.o
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obj-$(CONFIG_GPIO_TPIC2810) += gpio-tpic2810.o
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obj-$(CONFIG_GPIO_TPS65218) += gpio-tps65218.o
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obj-$(CONFIG_GPIO_TPS6586X) += gpio-tps6586x.o
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obj-$(CONFIG_GPIO_TPS65910) += gpio-tps65910.o
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obj-$(CONFIG_GPIO_TPS65912) += gpio-tps65912.o
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@ -0,0 +1,223 @@
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/*
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* Copyright 2015 Verifone Int.
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*
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* Author: Nicolas Saenz Julienne <nicolassaenzj@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify i t
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* under the terms of the GNU General Public License as published by th e
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* Free Software Foundation; either version 2 of the License, or (at you r
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* option) any later version.
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*
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* This driver is based on the gpio-tps65912 implementation.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/gpio/driver.h>
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#include <linux/platform_device.h>
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#include <linux/mfd/tps65218.h>
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#include "gpiolib.h"
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struct tps65218_gpio {
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struct tps65218 *tps65218;
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struct gpio_chip gpio_chip;
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};
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static int tps65218_gpio_get(struct gpio_chip *gc, unsigned offset)
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{
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struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
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struct tps65218 *tps65218 = tps65218_gpio->tps65218;
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unsigned int val;
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int ret;
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ret = tps65218_reg_read(tps65218, TPS65218_REG_ENABLE2, &val);
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if (ret)
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return ret;
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return !!(val & (TPS65218_ENABLE2_GPIO1 << offset));
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}
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static void tps65218_gpio_set(struct gpio_chip *gc, unsigned offset,
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int value)
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{
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struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
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struct tps65218 *tps65218 = tps65218_gpio->tps65218;
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if (value)
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tps65218_set_bits(tps65218, TPS65218_REG_ENABLE2,
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TPS65218_ENABLE2_GPIO1 << offset,
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TPS65218_ENABLE2_GPIO1 << offset,
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TPS65218_PROTECT_L1);
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else
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tps65218_clear_bits(tps65218, TPS65218_REG_ENABLE2,
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TPS65218_ENABLE2_GPIO1 << offset,
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TPS65218_PROTECT_L1);
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}
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static int tps65218_gpio_output(struct gpio_chip *gc, unsigned offset,
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int value)
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{
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/* Only drives GPOs */
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return 0;
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}
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static int tps65218_gpio_input(struct gpio_chip *gc, unsigned offset)
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{
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return -EPERM;
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}
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static int tps65218_gpio_request(struct gpio_chip *gc, unsigned offset)
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{
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struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
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struct tps65218 *tps65218 = tps65218_gpio->tps65218;
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unsigned long flags = gc->desc[offset].flags;
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int ret;
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if (flags & FLAG_OPEN_SOURCE) {
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dev_err(gc->parent, "can't work as open source\n");
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return -EINVAL;
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}
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switch (offset) {
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case 0:
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if (!(flags & FLAG_OPEN_DRAIN)) {
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dev_err(gc->parent, "GPO1 works only as open drain\n");
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return -EINVAL;
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}
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/* Disable sequencer for GPO1 */
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ret = tps65218_clear_bits(tps65218, TPS65218_REG_SEQ7,
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TPS65218_SEQ7_GPO1_SEQ_MASK,
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TPS65218_PROTECT_L1);
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if (ret)
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return ret;
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/* Setup GPO1 */
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ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG1,
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TPS65218_CONFIG1_IO1_SEL,
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TPS65218_PROTECT_L1);
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if (ret)
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return ret;
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break;
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case 1:
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/* GP02 is push-pull by default, can be set as open drain. */
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if (flags & FLAG_OPEN_DRAIN) {
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ret = tps65218_clear_bits(tps65218,
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TPS65218_REG_CONFIG1,
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TPS65218_CONFIG1_GPO2_BUF,
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TPS65218_PROTECT_L1);
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if (ret)
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return ret;
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}
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/* Setup GPO2 */
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ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG1,
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TPS65218_CONFIG1_IO1_SEL,
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TPS65218_PROTECT_L1);
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if (ret)
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return ret;
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break;
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case 2:
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if (!(flags & FLAG_OPEN_DRAIN)) {
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dev_err(gc->parent, "GPO3 works only as open drain\n");
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return -EINVAL;
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}
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/* Disable sequencer for GPO3 */
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ret = tps65218_clear_bits(tps65218, TPS65218_REG_SEQ7,
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TPS65218_SEQ7_GPO3_SEQ_MASK,
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TPS65218_PROTECT_L1);
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if (ret)
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return ret;
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/* Setup GPO3 */
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ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG2,
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TPS65218_CONFIG2_DC12_RST,
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TPS65218_PROTECT_L1);
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if (ret)
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return ret;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static struct gpio_chip template_chip = {
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.label = "gpio-tps65218",
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.owner = THIS_MODULE,
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.request = tps65218_gpio_request,
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.direction_output = tps65218_gpio_output,
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.direction_input = tps65218_gpio_input,
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.get = tps65218_gpio_get,
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.set = tps65218_gpio_set,
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.can_sleep = true,
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.ngpio = 3,
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.base = -1,
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};
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static int tps65218_gpio_probe(struct platform_device *pdev)
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{
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struct tps65218 *tps65218 = dev_get_drvdata(pdev->dev.parent);
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struct tps65218_gpio *tps65218_gpio;
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int ret;
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tps65218_gpio = devm_kzalloc(&pdev->dev, sizeof(*tps65218_gpio),
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GFP_KERNEL);
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if (!tps65218_gpio)
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return -ENOMEM;
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tps65218_gpio->tps65218 = tps65218;
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tps65218_gpio->gpio_chip = template_chip;
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tps65218_gpio->gpio_chip.parent = &pdev->dev;
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#ifdef CONFIG_OF_GPIO
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tps65218_gpio->gpio_chip.of_node = pdev->dev.of_node;
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#endif
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ret = gpiochip_add_data(&tps65218_gpio->gpio_chip, tps65218_gpio);
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if (ret < 0) {
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dev_err(&pdev->dev, "Failed to register gpiochip, %d\n", ret);
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return ret;
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}
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platform_set_drvdata(pdev, tps65218_gpio);
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return ret;
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}
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static int tps65218_gpio_remove(struct platform_device *pdev)
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{
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struct tps65218_gpio *tps65218_gpio = platform_get_drvdata(pdev);
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gpiochip_remove(&tps65218_gpio->gpio_chip);
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return 0;
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}
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static const struct of_device_id tps65218_dt_match[] = {
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{ .compatible = "ti,tps65218-gpio" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, tps65218_dt_match);
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static struct platform_driver tps65218_gpio_driver = {
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.driver = {
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.name = "tps65218-gpio",
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.of_match_table = of_match_ptr(tps65218_dt_match)
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},
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.probe = tps65218_gpio_probe,
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.remove = tps65218_gpio_remove,
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};
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module_platform_driver(tps65218_gpio_driver);
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MODULE_AUTHOR("Nicolas Saenz Julienne <nicolassaenzj@gmail.com>");
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MODULE_DESCRIPTION("GPO interface for TPS65218 PMICs");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:tps65218-gpio");
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